Matching N3LO QCD calculations to parton showers

Stefan Prestel

    Research output: Contribution to journalArticlepeer-review

    Abstract

    The search for new interactions and particles in high-energy collider physics relies on precise background predictions. This has led to many advances in combining precise fixed-order cross-section calculations with detailed event generator simulations. In recent years, fixed-order qcd calculations of inclusive cross sections at n3lo precision have emerged, followed by an impressive progress at producing differential results. Once differential results become publicly available, it would be prudent to embed these into event generators to allow the community to leverage these advances. This note offers some concrete thoughts on me+ps matching at third order in qcd. As a method for testing these thoughts, a toy calculation of e+e → uu¯ at O(αs3) is constructed, and combined with an event generator through unitary matching. The toy implementation may serve also as blueprint for high-precision qcd predictions at future lepton colliders. As a byproduct of the n3lo matching formula, a new nnlo+ps formula for processes with “additional” jets is obtained.

    Original languageEnglish
    Article number41
    JournalJournal of High Energy Physics
    Volume2021
    Issue number11
    DOIs
    Publication statusPublished - 2021 Nov

    Subject classification (UKÄ)

    • Subatomic Physics

    Free keywords

    • Perturbative QCD
    • Resummation

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